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Segment information - Schedule of Revenue by Geography Based on Customer Location (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue:
Revenue		$ 57,248	$ 52,176	$ 161,038	$ 132,643
United States [Member]
Revenue:
Revenue		55,755	47,372	153,601	119,385
Outside of the United States [Member]
Revenue:
Revenue	[1]	$ 1,493	$ 4,804	$ 7,437	$ 13,258
[1] No individual country, other than disclosed above, exceeded 10% of total consolidated revenue for any period presented.

X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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- References

No definition available.

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- Details

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- Details

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